Spinning pump



Oct.. 4,115,932. F. slEPER SPINNING PUMP me@ sept. ze. 1929 Fig Patented Oct. 4, 1932 UNITED" STATES PATENT OFFICE FRITZ SIEPER, F BARMEN-LANGERFELD, GERMANY, A'SSIGNOR TO BARMER MASCHINENFABRIK AKTIENGESELLSCHAFT, 0F BARMEN, GERMANY SPINNING PUMP Application filed September 28, 1929, Serial No. 395,934, and in Germany October 1, 1928.

In the artificial silk spinning process there is the diiiiculty that in the supply or discharge pipe of the spinning pump the pressure varies. In order that these varia.-

'5 tions of pressure may not be able to result in excessive differences of titre the pumps employed must be as fluidtight as possible.A

Even after a small amount of wear, the pumps are therefore no longer serviceable for the spinning process. In order to obviate these differences in the pressures in the supply and dischargepipes of the pump, it has hitherto been customary, from time to time, to exchange the filters, which are the main cause of the variations in pressure. Since however the spinning material of the spinning points varies with respect t0 impurities, this process does not by any means guarantee that the differences between the pressures in the supply and discharge pipes of the pump will not exceed a given maximum.

It has already been proposed to regulate the pressure inv artificial silk spinning pumps to avoid dili'erences of pressure immediately before and behind the pump by employing a supply pressure which is higher than the normal back pressure occurring in the discharge pipe. By means of the regulating device to which the supply pipe and the discharge pipe, as wellas the supply chamber and a discharge chamber of the, pump, are connected, the pressure in the discharge chamber is kept at the same level as the pressure in thesupply chamber, so that leakages in the pump cannot impair the action ot the pump. If the supply pressure varies- Y by falling off, for example, or if the discharge pressure gradually rises, owing to the lter connected thereto becoming choked, the throttling deviceis for instance so adjusted that equalization is provided for and no diference of pressure exists between the discharge chamber and the supply chamber of the pump. The adjusting of the throttling device may be effected automatically.

The devices proposed for this purpose consist of a valve moving in a valve casing connected to the supply and to the discharge chamber of a measuring pump, the valve acting as a throttling device and being provided with screw threads situated between the discharge chamber and the discharge pipe. It, for example, the discharge pressure rises gradually, owing to the filter connected thereto becoming choked, the valve moves in its easing and thethrottling screw thread` is thus adjusted so that the pressure drop between the discharge chamber and the discharge pipe becomes less and equalization takes place.

Another device proposed for this purpose comprises a separate casing'containing a throttling device, a valve regulated by a membrane, which `is moved'by differences of pressure occurring in the discharge pipe.

These devices are rather'expensive and not of the pressure in the supply and discharge chambers.

These drawbacks are removed by the present invention, which consists in a special arrangement of the regulating rooms and the diaphragm to the supply and discharge chamber. A diaphragm, acting as regulating device is interposed between a clamping piece and a front plate of the pump casing, this diaphragm separating two adjacent regulating chambers immediately connected to the supply and discharge chambers, respectively of the pump.

Now the guiding duct and the connection between the discharge chamber and the supply chamber arc arranged Ias follows Through a system of ducts the spinning solution Hows into a regulating chamber on one side of the diaphragm, from there into the supply chamber, from which it is conveyed by the toothed wheels -of the pump into the discharge chamber, whence the spinning -solution flows into the regulating chamber located on the other side of thediaphragm. .The regulating chambers are preferably designed as annular passages. The diaphragm in the deflected condition, bears against the projection formed bythe annular passage, and thereby throttles theV discharge of the spinning solution. j The projection on the other hand prevents an excessive convexity. One constructional form of the apparatus is illustrated by way of example in the aecompanying drawing, in which Figure 1 is a longitudinal section through the pump,

Figure2 is a cross section on the line 2-2 of Figure 1,

Figure 3 is a side view of the diaphragm, Figure 4 is a side view of the front plate of the pump, f

Figure 5 is a section on lthe line 5-5 of Figure 4 and, n

Figure 6 is a horizontal section on the line V6--6 of Figure 2. v

'Referring to the drawing, the pump comprises'the clamping piece 1, the cover plates 2 and 4 and the centre plate 3 ofthe pump casing. A curved inlet duct 1() extends through the clamping piece l, said inlet duct being in communication with an obliquel disposed duct 12 in the cover plate 2 throug 1 an aperture 11 in the diaphragm 5.' The duct 12 is inl open communication with an annular regulating duct 7 formed between the cover plate 2 and the diaphragm 5. From the re 13 which leads to the supply or suction chamber 19 of the pump. From the discharge 'chamber 20 of the pump extends a further shorter passage 14" which communicates through an aperture 14 in the diaphragm 5 with a duct 14 formed in the clamping piece 1 in which the inlet and discharge ducts l0, 16, respectively are provided. The duct 14 which, for the purpose of showing itI more "clearly, is shown in Figure 6 twisted round into the plane of the paper, 1s in com- 'munication with the annular regulating duct -6 formed between the elampingpiece 1 and the diaphragm 5 on the side of the diaphragm remote from the regulating duct 7. In the middle of the regulating duct or chamber 6 is a projection 8 through which extends the discharge duct regulating chamber 7 from the point at which the duct 12 is connected to it to the point where the duct 13 is connected to it in the two directions is different, in such a manner that the longer path offers comparatively small resistance to the flow of the material as compared with the resistance offered by the shorter path, the annular duet having a greater cross section along the longer path 7 a than along the shorter path 7 b.

In operating the regulating means a supim ply pressure is selected which is higher than gulating duct 7 extends a duct 16. Thecross section of the p Ia supply duct,'a supply chamber,

the normal counter pressure 'occurring in the discharge duct 16.

When 'starting the pump the spinning m'aterial is forced under pressure into the duct 10, flows through the bore 11 in the diaphragm and the duct 12 in the front plate 2,

and passes into the annular duct 7. Newv in consequence of the different cross sections of the duct 7, the spinning material does not flow through the short path between the ducts 12 and 13 but divides, the greater portion choosing the longer path corresponding to the greater cross-sectional area, fore lower resistance, through the annular duet from 12 to 13. In this way all dead points at which the spinning material might solidify are obviated in the annular duct 7. Owing to the pressure in the spinning material the diaphragm 5 projection 8 and thereby throttles the discharge duct'16. From the duct 13 the spinning material passes into the supply chamber, located in the centre plate 3'in front of the lpoint of engagement of the two toothed wheels `17 and `18. From there the spinning material is conveyed by the two toothed wheels 17 and 18 into the discharge chamber 20 (Figure 2) located above the engaging point, and from there thespinning material flows through the duct 14', the aperture 14" in the diaphragm and the duct 14 into the annular duct `6 and into the duct 16 in the projection 8 to the'outflow duct. The diaphragm 5 is deflected more or less in accordance'with the excess pressure in the inlet duct and the annular duct 7 and its distance from the projeetion varies. 'By this means the ilow of material to the lduct 16 is ob structed to a varying degree and the pressure prevailing in theregulating chamber 6 is `thus positively brought up to the level of the pressure prevailing in the regulating chamber 7, whereby 4the diaphragm 5 is lift- 'ed off the Aprojection 8 and the spinning material can pass freely into the discharge duct 16. Since moreover the -inlet and discharge chambers'of the .pump are ed to the regulating chambers 6, 7, then owing to the very short connecting ducts 13,114', 14, 14', any variation ofthe immediately produce an equalization of the ressure difference in the inlet and discharge chambers 19, 20 of the pump. Hence approximately equal pressures prevail rin the supply chamber and. in the discharge chamber, ow-

directly connectpressure will and thereis pressed agamst the iio i'ng to the diaphragm, so that leakages inthe i pum cannot impair the action.

at I claim is j A 1. Apparatus for regulating the pressure in gear wheel pumps having a pump casing,

chamber and a dischar artificial silk, comprisi the I combination with the pum casing an a clamping lpieee secured to sai pump casing, ofa regulatinga discharge ge duct fpr pumping" ist chamber situated between the pump casing and the clamping piece, chamber being interposed between said supply duct and supply chamber, a second regulating chamber situated between the pump casing and the clamping piece adjacent to said first-mentioned regulating chamber and interposed between the discharge chamber and the discharge duct and a resilient diaphragm interposed between said regulating chambers so as to separate the chambers, said discharge duct having the end thereof connected to the second regulating chamber positioned with respect to said diaphragm so as to enable the diaphragm to obstruct the How of fluid to the -discharge duct on the pressure in the first mentioned regulating chamber exceeding that in the second regulating chamber for keeping the pressure in the supply chamber at the same level as the pressure in the discharffe chamber, as and for the purposes set fort i. Y

2. Apparatus for regulating the pressure in gear wheel pumps having a pump casing, a supply duct, a supply chamber, a discharge chamber and a discharge duct for pumping artificial silk, comprising the combination with the pump casing and a clamping piece secured to said pumpl casing,`of an annular regulating chamber of varying cross-section adapted to offer the same resistance to the flow of liquid at all deliveries-situated be'- j tween the pump casing and the clamping piece, said regulating chamber being interposed between said supply duct and supply chamber, a second annular chamber situated between the pump casing and the clamping piece adjacent to said first-mentioned regu- .lating chamber and interposed between the discharge chamber and the discharge duct, circular projections in said regulating chambers, said discharge duct having the end thereof connected to the second regulating chamber in the circular projection in said chamber, and a resilient diaphragm interposed between said regulating chambers so as to separate the chambers for keeping the pressure in fthe supply chamber at the same v level as the pressure 1n the discharge chamber, as and for the purposes set forth.

3. Apparatus for regulating the pressure in gear Wheel pumps for pumping artificial silk, comprising the combination with a pump casing and a clamping piece secured to said pump casing, a pair of meshing.

toothed wheels in said pump casing, a supply chamber in the pump casing located .therein in front of the engaging point ofl the toothed wheels, a-discharge chamber in the pump casing located therein beyond the engaging point of the toothed Wheels, a supply pipe, a regulating chamber, a duct connected to said supply pipe and said regulat- -ing chamber, a second duct connected to said supply chamber and regulating chamber, a

said regulating second regulating chamber adjacent the firstmentioned regulating chamber, a duct connected to said second regulating chamber and to the discharge chamber, a discharge pipe, a resilient diaphragm interposed between the adjacent regulating chambers and a duct connected to said discharge pipe and to the second regulating chamber positioned with the end thereof connected to lthe chamber soas to enable the diaphragm to obstruct the flow of fluid to the discharge duct on the pressure in the first mentioned regulating chamber exceeding that in the second regulating chamber, as and for the purposes set forth. f*

4. Apparatus for regulating the pressure in gear wheel pumps for pumping artificial silk, comprising the combinationwith a pump casing and a clamping piece secured to said pump casing, a pair of meshing toothed Wheels in said pump casing, a supply chamber in the pump casing located therein in front of the engaging point of the toothed wheels, a discharge chamber in the pump casing located therein beyond the engaging point of the toothed Wheels, an annular regulating chamber in said pumpl casing, an annular regulating chamber in said clamping piece opposite the regulating chamber in the pump casing, a resilient diaphragm interposed between said regulating chambers, a supply pipe, a duct connected to said supply pipe and to one of said annular regulatingchambers, a duct connected to said regulatingchamber and to the supply chamber, a duct connected to the discharge chamber and to the other regulating chamber, a discharge pipe and a duct connected to said discharge pipe andother regulating chamber with the end thereof connected to the chamber positioned so as to enable the diaphragm to obstruct the How of fluid to the discharge duct on the pressure in the first mentioned regulating rchamber exceeding that in the second regulating chamber, as and for the purposes set forth.

5. Apparatus for regulating the pressure in gear wheel pumps for pumping artificial 1silk as set forth in claim 4, in which the reguatin it, w ich is connected to the supply chamber, has a diminished cross-sectional area in the neighborhood of the said duct and of the duct connected to the supply pipe.

In testimony whereof I have signed my nameV to this specification.

FRITZ SIEPER. 

